srcache_fetch subrequest return 405 error code.

[chrisLeeTW]

Hi, We're running into the issue that I always get resonse from upstream, not from redis cache.

And with some debug info, I found that my srcache_fetch subrequest always return 405 error code.

I using POST method with my request and I got problem. but I got correct response from redis cache with GET method.

Here is my nginx configuration.

upstream redis_pools {
    server 192.168.56.110:6379;
    keepalive 1024;
}

upstream search_tds_backend {
    server 172.26.1.118:80 max_fails=3;
    server 172.26.1.120:80 max_fails=3;
}

server {
    listen       80 default_server;
    server_name  localhost;

    redis2_connect_timeout  100ms;
    redis2_send_timeout     100ms;
    redis2_read_timeout     100ms;
    redis_connect_timeout   100ms;
    redis_send_timeout      100ms;
    redis_read_timeout      100ms;

    srcache_methods POST GET;

    location = /redis_cache_get {
        internal;
        set_unescape_uri $key $arg_key;
        set_md5 $key;
        set $redis_key $key;
        redis_gzip_flag 1;
        add_header X-Cache-From "has-cached";
        redis_pass redis_pools;
    }

    location = /redis_cache_set {
        internal;
        set_unescape_uri $exptime $arg_exptime;
        set_unescape_uri $key $arg_key;
        set_md5 $key;
        redis2_query set $key $echo_request_body;
        redis2_query expire $key $exptime;
        redis2_pass redis_pools;
    }

    location / {
        default_type application/json;

        if ($request_method = GET) {
            srcache_fetch GET /redis_cache_get key=$escaped_key&exptime=3600;
        }

        if ($request_method = POST) {
            srcache_fetch POST /redis_cache_get key=$escaped_key&exptime=3600;
        }

        set $key $uri;
        set_escape_uri $escaped_key $key;
        srcache_store POST /redis_cache_set key=$escaped_key&exptime=3600;

        proxy_pass http://search_tds_backend;
        proxy_set_header  Host "se.beta.hq.hiiir";
        add_header X-Cache-From "no-cached";
    }
}

And this is my debug info : http://pastebin.com/hbbbNuj5

So Can you confirm is this srcache_fetch bug or just my configuration mistake or misuse?

Thank you.

[chrisLeeTW]

sorry, my os is CentOS 6.6 64bit
here is my nginx version

nginx version: nginx/1.6.2
built by gcc 4.4.7 20120313 (Red Hat 4.4.7-11) (GCC) 
TLS SNI support enabled
configure arguments: --prefix=/opt/nginx/1.6.2 --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --user=www-data --group=www-data --with-http_ssl_module --with-http_realip_module --with-http_addition_module --with-http_sub_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_stub_status_module --with-file-aio --with-http_spdy_module --without-select_module --without-poll_module --without-http_ssi_module --without-http_autoindex_module --without-http_uwsgi_module --without-http_scgi_module --without-http_uwsgi_module --without-http_fastcgi_module --without-http_memcached_module --with-cc-opt='-O2 -g -pipe -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector --param=ssp-buffer-size=4 -m64 -mtune=generic' --with-ld-opt=-ljemalloc --with-libatomic --add-module=/root/nginx/nginx_module/nginx-http-sysguard --add-module=/root/nginx/nginx_module/redis2-nginx-module-0.11 --add-module=/root/nginx/nginx_module/srcache-nginx-module-0.28 --add-module=/root/nginx/nginx_module/lua-nginx-module-0.9.14 --add-module=/root/nginx/nginx_module/memc-nginx-module-0.15 --add-module=/root/nginx/nginx_module/ngx_devel_kit-0.2.19 --add-module=/root/nginx/nginx_module/set-misc-nginx-module-0.28 --add-module=/root/nginx/nginx_module/echo-nginx-module-0.57 --add-module=/root/nginx/nginx_module/ngx_http_redis-0.3.7 --with-debug

[agentzh]

@chrisLeeTW "if is evil". Please avoid using the "if" directive in your configuration. See

http://wiki.nginx.org/IfIsEvil

[agentzh]

@chrisLeeTW Also, the ngx_redis module does not expect a POST method request so you'd better avoid using the POST method in srcache_fetch. That should explain why you're getting the 405 error code.

[chrisLeeTW]

Thanks for your advice. I check the ngx_redis source code, And it did not allow the post method.

Sorry for the bother.